#!/usr/bin/env node

const http = require('http'),
      url = require('url'),
      qs  = require('querystring');

let items = [];

function genPage(){
  let dom = items.map(i => '<li>' + i + '</li>').join('\n');
  let html = `
    <!DOCTYPE html>
    <html lang="en">
    <head>
      <meta charset="UTF-8">
      <title>ToDo List</title>
    </head>
    <body>
      <h1>ToDo List</h1>
      <form method="GET" action="http://192.168.150.144:8000">
        <lable>用户名:</lable>
        <input type="text" name="item"/>
        <input type="submit" name="submit"/>
      </form>
      <ul id="items">
      ${dom}
      </ul>
    </body>
    </html>`;
  return html;
}

http.createServer((req,res)=>{
  //status code 
  //header txt/html
  let addr = url.parse(req.url);
  if(addr.pathname !=='/'){
    res.statusCode = 404;
    res.setHeader('Content-Type','text/html');
    res.end('<h1>Not Found!</h1>');
    return;
  }


  let item = qs.parse(addr.query).item;//input的name值设为item

  if(item !== '' && typeof item !=='undefined'){
    items.push(item);
  }


  res.writeHead(200,{
    'Content-Type':'text/html',
    'Content-Length':Buffer.byteLength(genPage())
  });  

  res.end(genPage());
}).listen(8000);
